Several studies have already pointed out a correlation of HMXBs with OB associations and/or spiral arms, either in close galaxies (e.g. [1]} [1]}, [3]} [3]} and [5]} [5]}) or in the Milky Way ([7]} [7]} and [9]} [9]}) on sets of tens of sources. Several studies also target specific HMXBs in order to infer their kinematical age ([11]} [11]}, [13]} [13]}, [15]} [15]}, [17]} [17]}, [19]} [19]} and [21]} [21]}).
